Well, it's classic 'denormalisation' isn't it? It sends two messages -
- Smoking in cars with children is wrong
- Smokers are selfish/stupid/whatever arseholes who smoke in cars with children therefore we need a law.
It doesn't matter that the vast majority of smokers these days wouldn't do this (out of courtesy if nothing else) or that a simple education campaign would do just as much good. It doesn't matter that children of car smokers are likely to also be subject to indoor smoke all the time at home. The purpose of the law isn't really to protect children's health (or at least that's incidental), it's to further shame smokers in the hope they will quit.
It's a noble aim (because smoking kills around half of all long term smokers) but a thoroughly dishonest tactic. Worst of all, it's stopped working. Those who could be shamed into quitting have largely already managed to quit. The ones who are left are frequently too ashamed to seek help with quitting, or have developed a defiant 'fuck you' attitude to tobacco control, for their own sanity.
We've seen this sort of thing before with the indoor public smoking ban. Here's what the House of Lords made of it:
77. In order to evaluate the operation of risk policy in this area, we considered a range of evidence, much of which cast doubt on the stated rationale of the legislation. In her evidence to us, Caroline Flint, Parliamentary Under Secretary of State for Public Health, commented that:
"it is clearly the case that, in relation to deaths from smoking and second-hand smoke, the most serious aspect of that is smoking in the home. Ninety-five percent of deaths are related to smoking in the home"[50].
Other evidence we received suggested that the health risks associated with passive smoking are relatively minor and the main harm, if there is one, concerns children who are exposed to passive smoking in the home, which is something the bill is not designed to address[51]. Sir Richard Peto did suggest that ex-smokers might be more at risk from ETS than those who had never smoked at all, but the general tenor of his evidence indicated that the risks are uncertain and unlikely to be large[52].
78. Given the evidence about the impact of passive smoking, we are concerned that the decision to ban smoking in public places may represent a disproportionate response to a relatively minor health concern. It may be that the unstated objective of policy is to encourage a reduction in active smoking by indirect means. This may well be a desirable policy objective, but if it is the objective, it should have been clearly stated.
-----
there is irrefutable scientific evidence that the smoke causes significant health damage to children.
There's some evidence of varying quality and a lot of bluster. The BMA got caught making stuff up in 2011 when this law was first proposed.